Compass attachment.



J. T. LIHON. COMPASS ATTACHMENT. APPLIoATIoN FILED MAY 1a, 190s.

Patented Dec. 29, 1908.

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PATENT oEEroE.

JAMES T. LIHON, OF SEYMOUR, CONNECTICUT.

ooMrAss ATTACHMENT.

Specification of Letters Patent.

Patented Dec. 29, 1908.

Application filed May 18, 1908. VSerial No. 433,440.

To all 'whom it may concern:

Be it known that I, JAMES T. LIHON, a citizen of the United States, andresiding at Seymour, in the county of New Haven and State ofConnecticut, have invented certainV new and useful Improvements inCompass Attachments, of which the following is a` specification, such aswill enable those skilled in the art to which it appertains to make anduse the same.

This invention relates to Compasses, and the object thereof is toprovide an attachment for devices of this class designed for use inlocating a ship with reference to some fixed object, such as alight-house for finding the compass error by the azimuth of the sun; forlinding the compass error by amplitudes; also to find the deviation of aship by terrestrial bearing and for taking compass bearings of objectsfor the various purposes of navigation.

The invention is fully disclosed in the following speciiication, ofwhich the accompanying drawing forms a part, in which the separate partsof my improvement are designated by suitable reference characters ineach of the views, and in which;-

Figure 1 is a plan view'of a compass provided with my improvedattachment, Fig. 2 a transverse vertical sectional view on the line 2*2of Fig. 1, Fig. 3 a transverse vertical section on the line 3*3 of Fig.2, Fig. 4 an end View of the top part of the construction shown in Fig.2 and with part of the construction omitted, and;-Fig. 5 a bottom` planview of a part of the attachment.

In the drawing forming part of this speciiication, I have shown'at a anordinary compass provided withy the usual transparent top plate a2 andhaving the usual lubbers line b, compass boX c, gimbal d and compasscard e, and in the practice of my invention I form centrally of thetransparent top plate a a socket or recess a3. v

The attachmentproper consists of a base plate f which is substantiallytriangular in form and provided with three feet f2 adapted to bear onthe plate c2, and fixed centrally in the base plate f is a pivot pin jain which is secured a shadow pin or wire g. The base plate a is alsoprovided with two vertically upper ends by a transverse which saidlcesses m2 and m3 arranged parallel rods from the pivot pin f3,

and the shadow pin or wire g, and these rods are connected at theirplate i having a central aperture t2, and mounted on the plate i is acentering block y' through which the shadow pin or wire g is passed, andin pin or wire is secured, and the block j is provided at the bottomthereof with a boss i2 which fits in and is movable in the aperture t2in the plate i.

The plate 'L is provided on the top thereof and arranged in a circlearound the block y' with a plurality of posts js which are preferablyfour in number,` and in each of these posts is a set screw k and bymeans of these set screws the position of the block may be regulated atall times, the object of this construction being to place the said blockor adjust it exactly centrally so that the shadow pin or wire g will beheld at an angle of 90 degrees to the top plate a2 of the compass.

The rods h are extended above the plate i, and one of said rods isprovided at the top thereof with a V-shaped recess h2 and the other witha pin or sharp edge h3, the object of this construction being to form asight With which to accurately locate an object as hereinafterdescribed. I also provide a pointer device or blade m'which is adaptedto be used in connection with the base plate and which is providedcentrally of one edge thereof with a recess m2 at the opposite sides ofwhich are other recesses m3, and the recorrespond with the pivot pin jsand with the rods h, and said ivot pin and rods are adapted to entersaidp recesses when the pointer device or blade m is placed in position.The said pointer device or blade m is also' provided on the bottomthereof with a pin m4 adapted to enter a corresponding recess m5 in theplate f, and when the pointer device or blade m is placed in position asshown in Figs. 1 and 2, the rods 71, and the pin js pass into saidrecesses and securely hold the pointer device or blade m in position andprevent its lateral or other movement.

The use of this device will be readily understood by any one familiarwith the art to h at equal distances which it relates when taken inconnection with the following statement. It at any time it be desired totake the bearing ot a ship by means of a 'fixed point on shore such as alight-house or other object, the attachl ment is rotated on the compassuntil the rods h are in the same plane with said object, this beingaccomplished by means of the sights at the top oi said rod. The pointerm will then indicate a certain point on the compass and the usualcalculations in order to determine the location of the ship may then bemade, and the same operation may be performed by use of the sun eitherat sunrise or sunset. The use et' the shadow pin g is the same as theuse ezt other devices of this class but with my construction the shadowpin g is a iine wire or rod and is supported both at its top and bottomand is always in proper condition and position for use and cannot beinjured by bending the top thereof or by dislocating the same asfrequently happens with other devices of this class, and by making thetop of said shadow pin, wire or rod adjustable, l provide means wherebyit may be held in proper position at all times. lt will be understoodthat the shadow pin or wire g is used independently of the rods 7L andthe pointer m, the latter being intended principally tor use when theweather is dull.

Having fully described my invention, what l claim as new and desire tosecure by Letters Patent, is

1. An attachment for Compasses comprising a base plate providedcentrally with a pivot adapted to enter a recess in the top plate of thecompass, said base plate being provided with a central aperture and twovertically arranged rods connected at their tops by a transverse blade,an adjustable block mounted on said transverse blade and over thecentral aperture formed therein, a shadow pin connected with the centralportion of the base plate and with said adjustable block, said rodsbeing projected above said plate and provided with sights.

2. A compass attachment adapted to be rotatably mounted centrally on thetop plate ot the compass, said attachment being provided with avertically arranged shadow pin or wire, the top of which is adjustableradially, and a pointer adapted to be connected horizontally with thebottom portion of the attachment.

3. An attachment for Compasses adapted to be rotatably mounted on thetop plate of a compass centrally thereof, said attachment being providedwith two vertically arranged rods between which is a vertically arrangedshadow pin or wire, said rods and wires being in the same verticalplane, and said rods being provided at their tops with sights, and apointer adapted to be connected horizontally with the bottom portion olthe attachment and the point of which is in the same plane with saidrods and shadow pin or wire. 4. A compass attachment adapted to bcrotatably mounted centrally on the top plate of a compass, saidattachment being provided with two vertically arranged rods, and apointer adapted to be connected horizontally with the bottom portion otthe attachment, and in the saine plane with said rods. 5. A compassattachment adapted to be rotatably mounted centrally on the top plate ofa compass, said attachment heilig provided with two vertically arrangedrods, and a pointer adapted to be connected horizontally with the bottomportion ot the attachment and in the same plane with said rods, saidattachment being also provided centrally with a vertically arrangedshadow pin, and means for supporting said shadow pin both at the top andbottom thereof.

6. A compass attachment adapted to be rotatably mounted centrally on thetop plate of a compass, said attachment being provided with twovertically arranged rods, and a pointer adapted to be connectedhorizontally with the bottom portion o' the attachment and in the sameplane with the said rods, said attachment being also provided centrallywith a vertically arranged shadow pin, supported both at the top andbottom thereof, and the top of which is radially adjustable.

7. A compass attachment adapted to be rotatably mounted on the top plateof a compass, said attachment being provided with a centrally arrangedshadow pin, and at the opposite sides thereof with two verticallyarranged rods which extend above the top of the shadow pin and areprovided at their tops with sights.

8. A compass attachment adapted to be rotatably mounted on the top plateot a compass, said attachment being provided with a centrally arrangedshadow pin, and at the opposite sides thereof with two verticallyarranged rods which extend above the top ol' the shadow pin and areprovided at their tops with sights, and a pointer adapted lo bedetachably connected horizontally with the bottom portion ot saidattachment and in the same plane as said rods and shadow pin.

9. An attachment tor a compass adapted to be rotatably mounted on thetop plate oll a compass and provided with a vertically arranged shadowpin, and means for supporting said pin both at the top and bottomthereof, the top supporting means being radially adjustable.

10. An attachment for a compass adapted to be rotatably and centrallymounted on the top plate of a compass, said attaelumnt being providedwith two vertically arranged pointer inthe same plane as said rods andpm.

l In testimony that I claim the foregoing as my invention I have signedmy name in pres- 1G Y ence of the subscribing Witnesses this 16th day ofMay, 1908.

' JAMES T. LIHON.

Witnesses:

M. E. Doom', C. E. MULREANY.

Correction in Letters Patent No.'908,110.

It is herebyccertied that the name of the patentee in Letters Patent No.908,110,

granted December 29,1908, for an improvement in Compass Attachments, was

erroneously written and printed James T. Llihon, whereas said nameshould have been written and printed James T. Lhou; and that the propercorrection has been made in the les and records of the Patent Oce, andis hereby made in said Letters Patent.

Signed and sealed this 9th day of February, A. D., 1909.

[SEAL] C. C. BILLINGS,

Acting Commissioner of Patents.

